Tripping mechanism



June 3, 1930. GRAVES ET AL TR IPPING M ECHANI SM Filed Aug, 20, 1928 2Sheets-Sheet l ATTORNEYS.

June 3, 1 930. B. P. GRAVES ET AL 'IRIPPING MECHANISM Filed Aug. 20,1928 2 Sheets-Sheet 2- ATTORNEYS.

Patented June 3, 1930 stares- PATENT101FFIE= BENJAMIN P. GRAVES, OFEDGEWOOD, AND VI ALTER F. SMITH, OF PROVIDENCE, RHODE ISLAND, ASSIG-NORSTO BROWN & SHABPE MANUFACTURING COMPANY, .OF PROVI- DENCE, RHODE ISLAND,A CORPORATION OF RTFIODEISLAND I 'rarrrrne MECHANISM Application filedAugust 20, 1928. Serial No. 3o0,912. j

This'invention relates to trip mechanism for power driven machine toolsand the like,

and has for its object to provide a construc- I ing operation withoutdisturbing the posi-.

tion of the trip plunger relative to the dog that automatically trippedit.

A further object of the invention is to accomplishthis tripping actionby the use of a two part plunger in which the whole plunger is moved byengagement with the dog tofarrest the operation of the. feed mechanismand one part of the plunger is permitted to be moved independently ofthe otherfpart there- I gaging the lever plates of the directional of torestore the feed connection without moving the dog-engaging part of theplunger from its stop position. I

The invention further consists in the provision of a trip plungercarried by one of the relatively traveling members ofthe machine and theforming of this plunger in two parts having a flexible member betweenthe parts through which a working movement is transmitted, one of theplunger parts being positioned to engage the trip'dog of the machine tomove the other part through the flexible member to stop the travel andmeans being also provided whereby the other of said parts I may be movedagainst the tension of this flexible member to again start the travelingmember without disturbing the first mentioned part of the plunger inengagement with the trip dog.

With these and other objects in view, the

invention consists of certain novel features of construction, as will bemore fully described, and particularly pointed out in the appendedclaims.

I In the accompanying drawings:

-Figure 1 isa perspective view illustrating the improved trip device asapplied to a 'milling machine for controlling the vertical ing twosets'of dogs, one of which may be mounted on a'traveling member tocooperate with the relatively fixedtripping plunger I I while the otherset is mounted on a relatively fixed member to cooperate with the trip fplunger, which is mounted on the relatively movable member. I

Figure 3 is an enlarged elevation partly in section illustrating myimproved two-part plunger andthe means for operatively connecting theparts of'the plunger togetherf i Figure 4 is a fragmental viewshowingthe keywayin the plunger as engaged by the end] of a screw to preventaxial rotation of'this plunger.

Figure 5 1s a' sectional end-view of the y Figure 6is a view partly insection show- I plunger on line 5 5' of Figure 3'.

ing the spring pressed latch members as enlever and in the feed engaginglever to assist in completing the throw of each to the desired position.

It is found 1n the practical operation of power driven. machinetools ofthis general character where adjustable tripping dogs are employed ononejmember of the machine to be engaged by a cooperating trip plunger ona relatively movable part of the machine, that where thisplunger isformed rigid and dogs out of alignment with the plunger, in

order to be able to reset the operating meohanism to continue or reverseits travel. To obviate this dihiculty and be permitted to again startthe traveling member without this manual adjustment of the members; we

have provided a plunger which'is formed in 1 two parts, a head to engagethe trip dog and clutch, and we have provided a coil spring a body partoperatively connected to the drive between these two parts of theplunger so arranged that a movement of the dOg-engaging or head part istransmitted to the other or body part to withdraw the clutch and stopthe machine, and by means of this spring connection between the partsthe body part may be moved against its tension to permit the clutch tobe'movedagain into engagement to restore the driving mecha nism withoutdisturbing the head part of the plunger from engagement with its dog;and the following is a detailed description of the present embodiment ofthe invention and showing one arrangement of mechanism by which theseadvantageous results may be ac complished:

WVith reference to the drawings 10 designates the traveling saddlemember of a milling machine which is provided with'a pair of spaced tripdogs 11 adapted to be adjusted toward and from each other in the usualway and 12 is a relatively fixed portion of the frame of the machine onwhich is shown another pair of spaced trip dogs 13 arranged to bevertically adjusted toward and from each other as-is usual in suchmachines.

In thepath of movement of the traveling dogs 11, we have operativelymounted a trip plunger 14 tobe actuated to stop the travel of the saddleupon engagement with the dog when fed to the required designated point,and a second trip plunger 15 is shown as being carried bycthevverticallymovable knee member 16'of the machine to work between the dogs 13 toarrest the travel of this knee upon engagement with a dog 13.

One general arrangementof mechanism is herein shown in Figure 2 forconnecting up these two trip plungers whereby each may act independentlyof the other to operatemechanism to arrest the travel of the membercontrolled by it.

In this mechanism is shown the gear 17 which is driven in one directionthrough gear 18, and gear 19 driven in the opposite direction throughthe gear 20 and idler 21.

The gear 17 is provided with clutch teeth 22 engaged by adjacent teethof the master clutch 23. This master clutch is mounted on the sleeve 24to which it is slidably connected by a key 25 and this clutch also hasteeth 26 onits opposite end to engage corresponding teeth 27 on thereverse gear 19.

By this construction it will be seen that the sleeve 24 may be rotatedin either direction and on one end thereof is formed clutch teeth 27arranged to engage those of the clutch 28, whereby when this clutch 28is in envagement with the sleeve 24 the lead screw 29 is rotated-todrive the nut 30 and through it cause the saddle 10 to move eitherinward or outward as desired and by withdrawing the .clutch 28 fromengagement, the saddle feed is stopped. When it is desired to start theknee member on its feeding movement, the feed engaging lever 34 is moveddownward, thereby causing the shift rod 33 to throw the clutch 35 intoengagement with the clutch 13 the plunger is forced inwardly which inturn operates the segment 37 and through the teeth 38 to move the shiftrod to the left and through yoke 39 remove the clutch teeth 35 fromclutch teeth 36 to stop the rotation of shaft 40 through gears 41 toarrest the vertical feed of the knee.

In practice the plunger in performing the feed stopping operation, ridesup onto the point of its dog and thus imparts motion to its plungersufficient to perform the stopping operation, and when this plunger wasmade solid it was necessary to either remove the engaged dog or tomanually rotate or operate members of the machine sufficiently to movethe plunger to clear the dog or vice versa which was found to beinconvenient as considerable time was wasted in again resetting themachine to'continue its feeding operation. Therefore, to obviate thisdifficulty the plunger has been constructed in two parts as bestillustrated in Figure 3, the head part 42, and the body part 43, thehead part being beveled on its end as at 44 to ride up on the beveledportion of the dog and in this head part has been screwed the threadedend of the spindle 45 to extend down through the central bore 46 in thebody, its lower end being provided with a nut 47 to limit the spacebetween the parts and this spindle is further secured in the head bymeans of the lock pin 48. The upper end of the body portion is providedwith areduced neck portion 49 which extends into a compression coilspring 50. One end of the coil engages the body shoulder 51, while theother end rests on the under face 52 of the head. This body portion isalso provided with a set of ratchet teeth 53 which are engaged by thesegment 37 through which motion is transmitted to the operating parts.

The head member is slotted longitudinally as at 54 into which the end 55of the screw 56 extends to hold its bevel in position to properly engagethe dog upon coming in contact therewith, the body part being retainedin proper axial alignment by engagement with its geared segment. By theuse of this improved construction, when this plunger head rides up ontoits dog, the spring is designed to be of sufficient stiffness to imparta corresponding motion to the body portion of the plunger and throughthis movement oft-he body portion operates the segment and the shift rodto arrest the motion of the traveling member. For instance, in the caseof plunger 14 when riding up on its dog 11 the clutch 28 is withdrawnfrom the teeth 27, thereby arresting rotation of screw28 and travel ofthe saddle 10.

If it is desired to reverse the direction of travel of saddle 10 throughscrew 28", it is only necessary to swingthe directional lever 59 upwardto position B which moves the master clutch from engagement with thegear of plunger the work to again start the travel- 17 into engagementwith reverse gear 19 to reverse the rotation of sleeve 24, then the feedwith one of its dogs 13, whereby when this plunger-is moved inwardly toremove clutch 35 from clutch .36 assuming that directional lever 59 isinposition illustrated, it may be moved from the position A to position Bto reverse the direction of rotation of clutch 35. Then feed engaginglever 34 may be moved from position 0 to position e to reengage theclutch 35 with clutch 36 and the feeding movement is resumed, withoutfirst being obliged to remove the plunger 15 from alignment with itsengaged dog 13.

The end 52 of the head and the end 57 of the body of the plunger areaccurately spaced to permit a sufficient movement of the body towardsthe head, when the head is partly thrown by the dog, to move the trippedmechanism back into operating engagement without disturbing the headmember of the plunger. Also, this space is so calculated that if thespring 50 should for any reason break, the movement of the head as theresult of a complete throwingby the dog will cause its end 52 to engagethe end 57 of the body portion and move the body portion justsufliciently to cause the teeth of one member of the feed clutch to bejust disengaged from the other member thereof, and in order to be surethat this disengagement is elfected, we have positioned the V-shaped endof the spring pressed latch 60 to engage the inclined wall 61 of thelever plate 62 geared to the rack rod 33 and so be sure todisengage theclutch members. Similar notches are also provided in this lever plate tocooperate with the movement of plunger 15 to assist in com pleting itsclutch moving operation in case the spring in this plunger should forany cause be broken. 3

By the use of this improved construction ing member into action isgreatly facilitated and much time is saved in the operation.

The foregoing description is directed solely towards the constructionillustrated, but We desire it to be understood that we reserve theprivilege of resorting to all the mechanical changes to which the deviceis susceptible, the invention being defined and limited only by theterms of the appended claims.

VVe claim s f a I 1. A trip mechanism for machines having relativelytraveling members, a trip dog carried by one of said members, acooperating trip element carried by the other of said members engageableby travel of said dog,

said element being formed in two parts, means whereby both parts areadapted to be moved upon engagement. of one part with said dog to stopthe traveling member and means for moving the other part independentlyof the engaged part to permit said member to resume its travel.

2. A trip mechanism for machines having relatively traveling members, astop dog-car ried by one of said members, a cooperating stop elementcarried by'anotherof said mem-' bers, said stop element being formed intwo connected parts, the first part arranged to engage the "dog, meansconnecting the second part with the travel control mechanism, saidsecond part being adapted to be moved relaf tive to the first part,means whereby engagement of said first part with said dog renders thetravel control mechanism inoperative, and means for moving said secondpart, independently of the first part, whereby said control mechanismmay be restored to operative position without moving said first partfrom its dog engaging position.

3. In a machine tool having relatively traveling members, a trip dog onone of said members, a cooperating trip plunger carried by the other ofsaid members, said plunger being formed in two parts, one part beingbeing operatively connected to the travel control of the movable member,a spring con-.

necting said parts,-bothparts being adapted to be moved upon engagementof the first part with said dog to shift the travel controltoinoperative position and stop the traveling member and means formoving the other part again st compression of the spring to shift thetravel control to operative position and permit the traveling member toresume its motion. I

4. In a machine tool having relatively traveling members,drivingmeehanism for part to render said driving mechanism oper-' ative.

5. A trlp mechanism for a machine having relatively travelingv memberswith a trip dog 'positionedto engage said dog and the other I on one ofsaid members, comprising a cooperating trip plunger carried on anotherof said members, said plunger being formed in tWo parts, one part havinga connecting guide spindle slidable in the other part, a compres sionspring acting between said parts, one of said parts being positioned toengage said dog to move the other partthrough said spring and stop saidtraveling member, and means whereby said other part may be independent-1y moved against the tension of said spring to again start the travelingmember Without disturbing the first mentioned part of said plunger fromengagement with its dog. 7 6. A trip mechanism for machines havingrelatively traveling members and travel co11- trol mechanism, a stop dogcarried by one of said members, a cooperating stop element carried byanother of said members, said stop element being formed in two connectedparts, a first part being arranged to engage the dog, means operativelyconnecting the second part With the travel control mechanism wherebymovement of said first part renders said control mechanism inoperative,said second part being movable relative to said first part, and meanswhereby movement of said second part restores said control mechanism tooperative position and causes said members to resume their relativetravel Without moving said first part from its dog engaging position.

7. In a trip mechanism for a. machine having relatively travelingmembers, a trip dog' on one of said members, a co-operating trig 35plunger carried by the other of said members,

said plunger being formed in two parts and having a yiel'dable memberintermediate said parts through which motion is transmitted from onepart to the other, and means for limiting the relative movement of bothof said plunger parts. j

8. In a trip mechanism for a machine having relatively movable members,cooperating tripping elements on said members arranged to arrestthetraveling member at a predetermined point in its travel, one of saidtripping elements comprising a plunger, said plunger being formed in twoparts, a spring inter posed between said parts and cooperating stops insaid parts for limiting the relative axial movement of the plunger partsin one direction.

9. In a trip mechanism for a machine having relatively travelingmembers, a trip dog 1 on one of said members, a cooperating trip plungercarried by the other of said members, said plunger being formed in twoparts, one part having a guide device slidable in the other part, ayieldable member intermediate said parts through Which motion is transmittedfrom one part to the other, and cooperating stop shoulders in saidplunger parts for limiting the relative axial movement of said plungerparts.

10. In a machine tool having two relatively movable members and adriving mechanism, a trip dog on one member, a movable dog enga ingelement on the other member, a shift element for said mechanism, meansoperatively connecting the dog engaging elementand the shift element formoving said sh it element when said dogrengaging element is moved bysaid trip dog, and means for independently moving said shift element.

11. In a machine tool having two relatively movable members, a drivingmechanism, a clutch therefor, tripping means on one mem her, a shiftcontrol element on the second member movable When engaged by said tripping means, means for uncoupling said clutch on movement of said shiftcontrol element, and means for coupling said clutch While said shiftcontrol element is in uncoupling postion, said uncoupling means beingconstructed to locl: said clutch in uncoupled position on furthermovement of said shift control element by said tripping means.

' In testimony whereof We atlix our signatures BENJAMIN P. GRAVES.WALTER F. SMITH.

